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is pixel similar

← isPixelSimilarQuantum   setColor →
Checks the distance between the color described by this ImagickPixel object and that of the provided object, by plotting their RGB values on the color cube. If the distance between the two points is less than the fuzz value given, the colors are similar. This method replaces ImagickPixel::isSimilar() and correctly normalises the fuzz value to ImageMagick QuantumRange.

A distance of '1' is the maximum distance in the color space e.g. from 0, 0, 0 to 255, 255, 255 in RGB color space.

The only difference between ImagickPixel::isSimilar and ImagickPixel::isPixelSimilar is that isSimilar needs to be scaled by the quantum value.


Color 1 Color 2 Test distance * 255 Is within distance
rgb(245, 0, 0) rgb(255, 0, 0) 5.196152423 no
rgb(245, 0, 0) rgb(255, 0, 0) 5.773502692 yes
rgb(0, 0, 0) rgb(7, 7, 0) 5.196152423 no
rgb(0, 0, 0) rgb(7, 7, 0) 5.773502692 yes
rgba(0, 0, 0, 1) rgba(7, 7, 0, 1) 5.196152423 no
rgba(0, 0, 0, 1) rgba(7, 7, 0, 1) 5.773502692 yes
rgb(128, 128, 128) rgb(128, 128, 120) 4.041451884 no
rgb(128, 128, 128) rgb(128, 128, 120) 4.618802154 yes
rgb(0, 0, 0) rgb(255, 255, 255) 254.9 no
rgb(0, 0, 0) rgb(255, 255, 255) 255 yes
rgb(255, 0, 0) rgb(0, 255, 255) 254.9 no
rgb(255, 0, 0) rgb(0, 255, 255) 255 yes
black rgba(0, 0, 0) 0 yes
black rgba(10, 0, 0, 1.0) 5.773502692 yes